Variable-feed pump.



HI R4 VARIABLE FEED PUMP. APPLICATION FILEQJULYZE. 1915. v

Patentd June 20, 1916.

2 SHEETSSHEETYI.

IQ I If I V ////////////l (ll/l Il -l H. R. SETZ. VARIABLE FEED PUMP.

I APPLICATION FILED JULY 26,1915.

Patented June 20, 1916.

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G G G I E I ,zwwza' Mfiefi Improvement in Variable-Feed Pumps, of which the following is a full. clear, andexact description. such as will enable others skilled y} in the art to which it appertains to make 'rnn STATES carton.

HANS R. sE'rz, or DE nonmmon'r, MISSOURI, Assxenon' To FULTON IIRON worms, 01

DE HODIAMONT, MISSOURI, A CORPORATION OF MISSOURI.

VARIABLE-FEED PUMP.

Specification of Letters Patent.

. Patented June 20, 1916.

lie it known that l. HANS R. slow, a citi zen of tluyl'11ited States. residing at De llodiamont. St. Louis county, li'llssouri, have mrcntcd a certain new and useful and use thesame.

This int a m-relates to variable feed pumps of'-'t-he type{described in the pending applications ofGeorge I)v logue. for variable feed pumps. Serial No. 967. iiledJanuary 7, 1915. and Serial No. 40678. liledJuly 1S),

1915. in which the pllinger-operating mech-- anismv consists of a fixed-stroke actuating described in said logue applications. butmember, a -variable-strolw member and an interposed connecting device that is adapted to be tripped or rendered inoperative at differcnt periods in the cycle of operations of the pump, so as to vary the supply from the The main object of my invention is to provide a pump that embodles all of the good features andcharacteristics of the pump which is so designed that the fixe'dstroke actuating member acts directly upon one end of the -variable-stroke member during thedisplacement stroke of the pump piston.

Another object to provide a pump of the type mentioned. in which the plungeroperating mechanism is composed of only, a few parts of simple design that can be made large and strong enough to successfully withstand the strains to which they are subjected when the pump is in service.

Another object is to provide a variable feed pump of the type mentioned. ingwhich the pllinger-opei'ating mechanism is strong. inexpensive to manufacture and capable of 7 being adjusted easily to compensate. for

-wear.

And still another object is to proride a variable feed pump of the type men.- tioned. which com nises a novel means for rendering the plungers of the pump inoperative without stopping the propelling or driving mechanism of the pump.

1 the!" objects and desirable features of my invention will be hereinafter pointed out;

Figure 1 of the drawings is a vertical transverse-sectional view of a variable feed pump constructed in accordance with my invention. Fig. 1v is a detail view, illustrating one of the adjustable rock arms that sentsthe preferred form of my invention,

the connecting element of each plungeroperating mechanism is tripped automatically, sooner or later, on the suction stroke of the plunger, so as to regulate the supplyfrom the cylinder with which the plunger ootipen' ates, but itis immaterial, so far as certain features of my invention are concerned, whether said connecting element istripped on the suction stroke of the pump plunger or on the displacement stroke of said plunger.

As shown in the drawings, the pump. is provided with a plurality of plungers A, eachof which reciprocates in a cylin-der'B that is equipped with an inlet valve 1 and one or more discharge valves '2 A separate and distinct operating mechanism is provided for each plunger and all of said pllinger-operating mechanisms are propelled or actuated from a single crank shaft C, driven by some suitable means (not shown)- and provided with crank arms that are connected by means of links 3- with the fixed? stroke actuating members of 'the plunger- Each pllinger-operatingmechanism contsists of a fixed-stroke actuating member D,

a variable-stroke meinber E and a connect-- ing element or dev ce F that transmits move-.

meat from the fixed-strokemember to the vaMable-stroke member on the suctlon stroke of the pump plunger, the members D and E being so designed and 'arranged that the fixed-stroke member D \vill act directly upon the variable-stroke member E during the displacement stroke of the plunger. The fixed-stroke member D is provided at itslower end with a bifurcated portion andv the. connecting element I is pivotally monnted in said bifurcated portion at one side of the longitudinal axis of the, member D.

The variable-stroke ember E preferably consists of an extension on the pumpplnm g i I 1,188,381

ger B, and said member l extends upwardly through the bifurcated portion of 'the' member D at one side of the connecting element F, the upper end portion. 5 of the variablestroke member E projecting into a socket or guidewily in the fixed-stroke member D, as shown clearly in Fig. 1. The connecting element F cooperates-with a shoulder on the variable-stroke member E, which is preferably formed by a block 6 that is arranged below the guiding portion 5 at the upper end of the member E, said block co6perating with the sideparts of the bifurcated portion of the actuating member D, to prevent'the variable-stroke member from turning. The upper end of the connecting element F is normally held in engagement with the shoulder (l on the member E by means of a spring 7 on the member D, as shown in 'Fig. 1, and said-connecting element is provided at its lower end with a roll 8 that cooperates with a tripping deviceat a certain period in the cycle of operations of the pump, as hereinafter described.

One desirable feature of'a plunger-operating mechanism ofthe construction above- .described is that thefixedstroke actuating member D bears directly upon the upper end of the variable-stroke member E and exerts a direct thrustbn the variable-stroke member, during the displacement stroke of the pump plunger, thereby redu cing to a.

minimmmthe liability ofthe plunger-oper- 'ating mechanismgetting out of order on account of any parts of same breaklng.

The members D and 1G consist of two rugged parts that can be manufactured cheaply by simple machine operations; and still another desirable feature of such a construction is that the fixed-stroke member ,acts a guide for the variable-stroke member and prevents said valiable-stroke member from turning or moving out of longitudinal alinement with the parts that move same. lf 'the shoulder on the variable-stroke member with which the connecting element F cooperates becomes worn, the member E can be removed from the member ,D and given a quarter turn, so as to bring a different sin-face on the block (3' into operative position with relation to'the connecting element F Such a construction also'makes it possible to keep the cooperating parts of the pllmger-o ')erating mechanism thoroughly lubricated, when the pump is in operation, this being effected by forming a, lubricatin duct 9 in the member D, as shown in full lines in Fig. l and a lubricating duct 10 in the member E, as shown in dotted lines in Fig. l. After the variable-stroke member 1) has come to rest,'during the suction stroke of the actuating member D, the partial vacuum that is cr bated in the upper end portion of the socket in'the member D, in which the guiding portion 5 of the variable-stroke u member is arranged, causes oil to be sucked out of the housing 4 through the duct 9 that establishes comm]mication between said housing and said socket. ()n the succeeding displacen'icnt stroke of the actuating member D the surplus oil in said socket will be forced back into the housing through the oil duct 9, but a thin film of oil will remain between the upper'cnd of the guiding portion 5 on the variable-stroke member and the end wall of thesocket, and thus'partially reduce the impact between said surfaces and also prevent said surfaces from wearing rapidly. Some of the oil also leaks downwardly through the duct 10 in the variable-stroke member and. escapes laterally through the branches at the lower end of the duct to theouter surfaces of the variablestroke member D on which the connecting element F normally bears, thereby preventing excessive wear on these cooperating-surfaces.

l The mechanism for governing the supply from the pump consists of a plurality of tripping devices that trip the connecting elements 1* orvcause said elements to be rendered inoperative sooner or later on the suction stroke of the plunger-operating mechanism. A tripping device is provided for the plunger-operating mechanism of each cylinder and all of said tripping devices are under the control of an automatic governing device and also a. manually-operated means that is of novel construction and so designed that it is possible to cut all of the cylinders of the pump out of service In the pump herein shown the tripping devices, previously referred to, consist of. sliding blocks (i that cooperate with friction rolls 8 on the connecting elements F in such a manner that each of said connecting elements F will he disengaged from its cooperatii'ig wu'iable-stroke member before the fixed-stroke member that-carries said connecting element reachesits upper limit of movement. Each of said blocks has a flat surface at that lies parallel to the axis of the fixed-stroke member D and alsoan inclined or oblique surface 11 as shown in Fig. l, the position of said. surfaces being such that the friction roll 8 on each of the connecting elements F will travel over the inclined, surface 11 of its cooperating tripping block and then onto the surface :1: on said block, during the upward stroke of the actuating member I). thereby causing said operatively connected with the automatic governor of the engine in such a manner that the position of said sha'ftH will change when the collar I of the governor movesup and down, owing .to variationsin the speed of the engine, themeans herein illustrated a for transmitting movement from 1 the gov ernor collar I to the rock shaft H consistmg of an arm 12 on said. rock shaftand a rod 13 that cooperates witha yoke-shaped rock arm 1-1 which is connected to the governor collar by means of links 15, as shown in Fig. 1.

In order that therelative amount of fuel supplied by 'any cylinder of the pump may be increased or decreased, I have'connectcd thearms 11 to the rock .shaft H in such a manner that said arms can be adjusted relatively to said rock shaft. One convenient Way of accomplishing this is to provide the rock shaft H witha rigid hub 11 for each of the arms 11 and equip said hub with two adjusting screws 11" and 11, as shown in Fig.1 that bear against shoulders on said arms. By manipulating the screws 11 and 11 the position of the arms 11 canbe changed easily, so as to vary the position of of the station'aryhubs 11 on the shaft H with a pointer'16,'as shown in Fig. 2, that cooperates with graduations 17 on the hub portion of the particular-lever with which it cooperates. The rod 13 that connects the shaft H with'the rock arm 14 passes freely through a guide wing 11 on the hub of the rock arm 11 and is'normally held in fixed relation with said rock arm by means of a nut 19 on the rod 13that bears against the upper side of the wing 14?, and a spring 20 that is arranged between the underside of said wing anda stop 21 on the lower end of the rod 13, as shown in Fig. 1, said spring 20 being strong enough so'that it will not give or yield when the arm 1i is rocked by the movement of the governor collar L If it is desired to cut all of the pump cylinders out ofservicewhile' the fixed-stroke members of the plunger-operating mechanisms continue in operation, the rod 13 is moved upwardly, so as to arrange the nut '19 thereonis such a'position that it will not be engaged by the wing 14 on the. rock arm 14: when said rock arm is moved upwardly by thegovernor collar, it, of course,'being un derstood that the upward movement of the rod 13 causes the shaft H to be rocked into such a position that the tripping blocks G engage the connecting elements-F of the l plnngenoperatmg mechanisms and hold said connecting elements in an operative position. One means that may be employedof the lever.

for moving the 'rod 13 upwardly so as to render said rod inoperative with relation to the governor-controlled rock arm 14. consists of a ma nually-operated lever 22, shown in Fig 2, 'which is provided with a bifur cated end that straddles the rod 13 and en gages a shoulder 23 thereon when the free.

end of said lever is depressed, said lever 22 being provided with any suitable means for locking it in its depressed position; means herein shown for this purpose ci sisting of a pin, 24 in the lever that is'ad I ed to enter an opening in a stationa plate 26 arranged in proximity to thehandl I A means of the constructionabove described for actuating the tripping blocks (1: is of such simple design that it is not apt to get out of order; it'is inexpensive to manufacture; it enables the arms 11 that actuate the tripping blocks to be adjusted accurately with relation to the governor.- controlled shaft on 'lllClL the arms 'are mounted and it enables allot the connecting elements of the pllInger-operatingmechanisms to be rendered inoperative simultaneously.

In order that one or more cylinders of the pump may be cut out otfscrvirc without affecting the operation of the other cylinders, I have provided each cylinder with a manually-operated cut-oil valve 27 shown ill-Fig. 1, that is adapted to be. moved into positionto close the inlet pipe 28 to the cylinder, the stem of said valve having a screw-threaded portion so as to enable said valve to be closed and opened by rotating the stem of the valve which projects outwardly through a stuffing box :29. H desired, each cylinder of the pump may be provided with a manually-opcralilc priming plunger 30 for drawing the liquid into the plunger being normally locked in an inoperative position by means of a wing nut 31 that is mountcd on a scrcw-thrcadcd portion on the stem of the plunger. as sliownin Fig. 1. lVhen said wing nut is loosened or cylinder-of the pump to prime same, said' backed'away from the stutling box thrmlgh.

"which the stem of the. plunger projects. the plunger 30 can be operated manually so as to draw the liquid from the supply pipe 2? through the inlet valve into the cylinder of the pump.

It is immaterial. so far as my broad idea is concerned. how the vframe or body of the pump is formed, but I prefer to form each pump cylinder and its cooperat ng valves as a separate-unit that is detac iably connected to the frame of the pump in which the plunger-operating mechanism is mounted. As shown in Figs. 1 and 2, the frame 32, in which the fixed-stroke actuating men bers and the tripping blocks are mounted, s provided with a bottom cross piece 33 that is arranged underthe portion ofthe frame in which the actuating members D are guided. Each pumpcylinder B is formed in a separate casting 34 and all of said castings are detachably connected to said cross piece 33, from which they depend, as shown in Fig. 2. pump cylinder castings 3st to the frame of the pump is illustrated in Fig. 2, wherein 35 designates a reduced cylindrical extension on the upper end of the casting that projects upwardly through the cross piece 33 and which is provided with external screwthreads onto which a clamping nut 36 is plunger-operating mechanism that comprises a fixed-stroke actuating member, a

variabhe-stroke member arranged so that the actuating member will hear on one end of same when said actuating member moves in one direction, a connecting element for transmitting movement from the actuating memberito the variable-stroke member when said actuating member moves in the opposite direction, and cooperating guiding portions' of said members, arranged, intermediate the connecting element and the end of said variable-stroke member for preventing said variable-stroke member from turninm;

2. variable feed pump provided with a phInger-operating mechanism that co nprises a. fixed-stroke actuating member, a variable-stroke men'iber', a tripable connecting element arranged intermediate the ends oi said variable-stroke member for transmitting'movel'i'ient from the actuating member to the fvariable-stroke member when said actuating member moves in one direction, and a rigid extension on said variable-stroke member that projects beyond said connecting element and whose end is engaged by said actuating member when the latter n iovcs in the opposite direction.

A variable teed pump provided with a plunger-operating mechanism that comprises a fiXttl-Stl'Oht actuating member, a variable-stroke member. a (-om ccting element carried by said actuatingmember and adapted to engage a shoulder on said variable-strolw member, said actuating member having a socket, and an end portion on said variable-stroke member arranged be yond the shoulder thereon and projecting into the socket in said actuating member.

4-. A variable teed pump provided with a plunger-operating mechanism that comprises a fixed-stroke actuating member, a variable-stroke member that IS guided by One convenient way of connecting the 'said actuating member, and a connecting element carried by said actuating member and adapted ttrengage a shoulder on said variable-stroke member located intermedi ate the ends of same, said variable-stroke member having a portion projecting be yond said shoulder which is engaged by the fixed-stroke member when the latter moves in one direction.

5. A variable feed pump provided with a plunger-operating mechanism that comprises a fixed-stroke actuating member provided with a socket, a variable-strolte member provided with a solid shank that projects into said socket and bears against the bottom of same when said actuating member moves in one direction, and. a movable connecting element on said actuating member cated portion of said member, and a tripable connecting element in said bifurcated portion arranged at one side of the longitudinal axis of said variable-stroke member and adapted to engage and move same.

7. A variable feed pump provided with a plunger-operating mechanism that comprises a fixed-stroke actuating member, a

I variable-stroke member integrally connected to the pump plunger and provided with an end bortion that fits in an opening in said actuating member, and a shoulder on said variablestroke member arranged intermediate the ends of same and adapted to cooperate with a tripable connecting element on the actuating member.

8. Av variable teed pump provided with a plungeuoperating mechanism that comprises a variable-stroke member that is attached to the pump plunger, a fiXttl-Stl'Oke actuating member that exerts a direct thrust on the end of said variable-stroke member when said actuating member moves in one direction, and .a movable means aranged intermediate the ends ot'said-variable-stroke member for coupling said members together on the reverse stroke of said actuating menr her.

9, A variable teed pump provided with plungcr-operating mcchanisu'i that comprises a fixed-stroke actuating member, a variable-stroke member, a tripablc connecting element on said actuating member, and a portion on said variable-stroke member oil to be supplied to the end face of said variable-stro to member and to the surface of said actuating member that cooperates with said end face.

11. A variable feed pump provided with a plungermperating mechanism that :comprises a fixed-stroke actuating member provided with. a socket, a variable-stroke mem- .ber having a portion that projects into said socket, and means for causing a lubricating medium to be supplied to said socketso as to form a film of oil between the, variablestroke member and the end ,wall of said socket that bears against same when the actuating member moves in one direction.

12. A variable feed pump provided-with a plunger-operating mechanism that .comprises a crank shaft, an 011 housing that incases said crank shaft, a fixed-stroke actuating member operated by said crank shaft, said actuating member having'a socket, a variable-stroke member. having a portion that projects into said socket, and

an oil duct in said actuating member that establishes. communication between the socket therein and said oil housing.

13. A variable feed pump provided with a plunger-operating mechanism that comprises 'a crank shaft, an oil housing that incases said crankshaft, a fixed-stroke actuating member operated by said crank shaft, said actuating member having a. socket, a

for causing lubricating oil to flow into and out of said socket at each cycle of operations of the plunger-operating mechanism.

15. A variable feed pump provided with a fixed-stroke actuating member, a variable'- stroke member, a connecting eleinent for coupling said members together when the actuating member moves in one direction, a

tripping device for said connecting element, an automatic adjusting mechanism for said tripping device comprising two parts, a spring that normally holds said parts in such a position with relation to eachother that they move in unison, and means for compressing said spring so as to render one part inoperative with relation to the other. 16. A variable feed pump provided with afix'edstroke actuating member, a variablestroke member, a connecting element for coupling saidmembers together when the actuating member moves n one dlrection, a tripping device for said connecting element,

.an automatic adjustingmechanism for said tripping device comprising two parts, one of which has a guide through which the other part passes freely, a stop on the part that passes throughsaid guide, a resilient means that normally holds said stop in engagement with said guide, and means for enabling said'stop to be moved away from said guide so as to render one part inoper' tive with relation to the other.

17. A variable feed pump provided with a fixed-stroke actuating member, a variablevariable-stroke member having a portioir that projects into said socket, an oil duct in said actuating member that establishes communication between the socket therein and said oilghousing, a tripable connecting element on said actuating member that coopera'tes with said variable-stroke member, and means for supplying lubricating oil to the outer surface of said variable-stroke member.

14. A variable feed pump provided with a )lunger-operating mechanism comprising xe d-stroke actuating member that is provided with a socket, a variable-stroke memher having a portion that projects into said socket and whose end is engaged by the end wall of said socket when the actuating memher I oves in one direction, means for causing s, id variable-stroke member to come to ,rest' prior to the completion of the return stroke of said actuating member, and means coupling said members together when the actuating member moves in one direction, a tripping device for said connecting element, anautomatic adjusting mechanism for said tripping device comprising a rockable member provided with a guide, a rod that passes loosely through said guide. a stop on said rod that bears against one side of said guide, a spring on said rod interposed between the other side-of said guide and a shoulder on said rod, and means for moving said rod so as'to compress said spring and arrange the stop on the rod in an inoperative position with relation to the guide on said rockable int nber. 18. A variable feed pump provided with a plunger-operating mechanism that comprises a tripping device, a governor-controlled rock shaft. an arnr loosely mounted on said rock shaft for actuating said tripping device. and a plurality of adjusting screws on said shaft that are adapted to engage shoulders on said arm and hold said a'rm rigid with respect to said rock shaft.

19...-\ variable feed pump provided with a pllmger-operating mechanism that come trolled rock shaft, an arm loosely mounted on said rock shaft, for actuating said trip-' ping device, a plurality of ad usting screws to be rendered inoperative with relation to ahle element, a rod'for transmitting moveon said shaft that are adapted to engage In testimony whereof I hereunto affix iny shoulders on said arm and hold said arm signature in the presence oft'Wo witnesses, 10 rigid with respect to said rock shaft, a roekthis twenty-third day of J 111371915.

. T r ment from said rockable element to said H'ABS SET/j: rock shaft, and means for enabling said rod \Vitnesses: \Vnnns L. CHURCH-I,- i

said rockable element. GEORGE BAKEWELL. 

